How many times of standard deviation is specification limit to the mean? If it is 2 times, then it is at 2sigma, if 3 times 3sigma, 4 times 4sigma, 5 times 5sigma.
If six standard deviations can be fitted between the mean and USL, then the process is at 6sigma. So, lesser the standard deviation, more number of them can be fit between those mean and USL thus pushing up the sigma level.
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